US20050242626A1 - Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same - Google Patents
Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same Download PDFInfo
- Publication number
- US20050242626A1 US20050242626A1 US11/099,131 US9913105A US2005242626A1 US 20050242626 A1 US20050242626 A1 US 20050242626A1 US 9913105 A US9913105 A US 9913105A US 2005242626 A1 US2005242626 A1 US 2005242626A1
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- US
- United States
- Prior art keywords
- inner roof
- roof panel
- cellular core
- skin
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H33/00—Bathing devices for special therapeutic or hygienic purposes
- A61H33/60—Components specifically designed for the therapeutic baths of groups A61H33/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
Abstract
The invention relates to reinforced composite inner roof panels of the sandwich-type having a cellular core. In a method for making a inner roof panel of the invention, a stack is formed that is made up of: an upper skin made of a reinforced thermoplastic material; a cellular core made of a thermoplastic material; and a bottom skin made of a reinforced thermoplastic material. The upper and lower skins and the cellular core are formed together and have regions of reduced thickness and regions of increased thickness that may provide head impact absorbing characteristics or form structural components of the passenger compartment. Examples of structural components that may be formed include HVAC ducts, wiring conduits, video display panel mounts or air bag receptacles.
Description
- This application is related to U.S. application Ser. No. 10/016,274 filed Oct. 30, 2001, entitled “A Reinforced Composite Vehicle Load Floor Of The Cellular-Core Sandwich Type” and U.S. application Ser. No. 09/485,142, filed Jun. 3, 1999, entitled “A Method of Making a Reinforced Composite Panel of the Cellular-Core Sandwich Type and a Panel Obtained By Performing Such a Method.” This application is also related to U.S. application Ser. No. 09/960,436 filed Sep. 21, 2001 and entitled “Engine Under Tray for a Vehicle With Improved Strength” and U.S. application Ser. No. 09/525,785, filed Mar. 15, 2000, entitled “Method and System for Molding Thermoplastic Sandwich Material and Deep-Drawn Article Produced Thereby.”
- 1. Field of the Invention
- The present invention relates generally to an inner roof panel for a removable hardtop for a vehicle that is made with a sandwich-type composite structure having a cellular core and, in particular, to such an inner roof panel that is formed with varied thicknesses being provided in selected areas for special purposes.
- 2. Background Art
- Panels of sandwich-type composite structures having a cellular core have favorable weight and strength characteristics. Such panels are in common use in shipbuilding, aircraft construction, and rail vehicle construction. In the field of aircraft construction, sandwich structure composite panels are made that are based on thermoset resins reinforced with glass fibers. Non-uniform mechanical stresses to which they are subjected sometimes makes it necessary to form local reinforcing plies at those places in the panels where the mechanical stresses are concentrated.
- In order to impart the desired shapes to the panels, and to maintain the shapes, the glass fibers and the thermoset resin (in the form of pre-impregnates) are deposited layer-by-layer in a mold, and are then heated to high temperatures so as to cure (i.e. polymerize) the resin permanently.
- The first step in making locally-reinforced panels is to define zones where stresses are concentrated in the resulting panels, such zones being defined either by real testing or by computer simulation. After the zones are defined reinforcing plies are added at those places so as to make it possible to withstand such stresses.
- The reinforcing plies may have oriented mats of woven fabrics of glass fibers, carbon fibers, or natural fibers embedded in a thermoset resin. The orientation of the fibers is selected according to the location of the stresses. The reinforcing plies are cut out to a pattern using special machines, e.g. water-jet cutting machines. The reinforcing plies are disposed layer-by-layer in a mold, either manually or by means of a robot, with each ply having a preferred orientation.
- The next step is a baking step. The baking step is the step having the longest duration of the method of making such pieces because the stack of layers must be heated throughout while in the mold.
- After baking the layers of thermoset material and reinforcing fibers disposed in the mold are pressed in the mold by evacuating the mold. Such evacuation presses the materials against the die or the punch to form into the desired shape and remove surplus resin. The desired shape panel is obtained with the reinforcing fibers being throughly impregnated with the resin.
- This “lamination” technique, and in particular the “laying up” operation, is characterized by a very low level of automation, and a large labor input. This lamination technique makes it possible to achieve high strength performance levels but requires rigorous monitoring of quality. This technique is very costly and cannot be used at the high production volumes required in many fields such as the automobile industry.
- Plastics processing technology has enjoyed significant recent advances, such that traditional high-strength materials such as metals are being replaced with fiber composite materials. These materials are not only light, but also are flexible and durable.
- Thermoplastic composites have potential for solving many of the problems associated with thermosets. For example, unlike thermosets, thermoplastic can be reshaped, welded, staked, or thermoformed. Furthermore, thermoplastic are generally tougher, more ductile, and have greater elongation than thermosets.
- An object of the present invention is to provide a reinforced composite inner roof panel of the cellular core sandwich-type which can be made simply and inexpensively, and can be implemented with high production techniques.
- In carrying out the above object and other objects of the present invention, a reinforced composite inner roof panel of the sandwich type having a cellular core is disclosed. The inner roof panel includes: a) an upper skin made of a reinforced thermoplastic material; b) a cellular core made of a thermoplastic material; and c) a bottom skin made of a reinforced thermoplastic material. The upper and lower skins and the cellular core are formed together into a concave shape relative to the passenger compartment of the vehicle and have regions of increased thickness that may provide head impact absorbing characteristics or other structural components.
- The inner roof panel may include at least one outer covering layer made of a woven or non-woven fabric disposed on the lower surface of the bottom skin such that the inner roof panel is covered with an integral headliner.
- The inner roof panel substantially conforms to the general shape of the outer roof panel and may be made in a single pressing stage. The single pressing stage may have a forming pressure for forming the inner roof panel which lies in the
range 106 Pa to 3×106 Pa. The skins may have a forming temperature in the range approximately 160° C. to 200° C. while the inner roof panel is formed. Alternatively, if the inner roof panel is a deep-drawn inner roof panel, a pair of pressing stages may be used to form the inner roof panel. - The skins may be made of a woven fabric or mat of reinforcing fibers and a thermoplastic material. The composite may include a depolymerizable and repolymerizable thermoplastic polymer resin. For example, the resin may be a thermoplastic polyurethane or a polyolefin, such as polypropylene.
- The cellular core of the inner roof panel may have an open-celled structure of the tubular or honeycomb cell type, constituted mainly of a polyolefin such as polypropylene.
- The inner roof panel may be a structural component of a vehicle passenger compartment and may be formed to accommodate or define heating, ventilation and air conditioning (HVAC) ducts, video display mounts, wiring conduit and side curtain air bag pockets. To form such structures the inner roof panel may have predetermined regions of varied thickness.
- The thickness of the inner roof panel may vary by more than five times. For example, the roof inner panel may be 3 millimeters thick over most of its surface area and locally thickened to 15 millimeters to form a HVAC duct or other structure.
- The above object and other objects, features, and advantages of the present invention are readily apparent from the following detailed description of the best mode for carrying out the invention when taken in connection with the accompanying drawings.
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FIG. 1 is a fragmentary side elevation view of a vehicle having a removable hardtop; -
FIG. 2 is a simplified exploded view of a removable roof having an outer roof panel, an inner roof panel and a headliner; -
FIG. 3 is a side schematic view of a stack of layers of an inner roof panel of the present invention wherein the top layer is partially removed; -
FIG. 4 is a top plan view of a inner roof panel of the present invention having structural members molded therein including a HVAC duct or a wiring conduit, a video panel display mount and air bag receptacles; and -
FIG. 5 is a cross-section view taken along the line 5-5 inFIG. 4 . - Referring now to
FIGS. 1 and 2 , aremovable roof assembly 10 is shown that includes anouter roof panel 12 and a moldedinner roof panel 14 that are secured together. Aheadliner 16 is preferably clipped, fastened, or bonded to theinner roof panel 14 on the opposite side from theouter roof panel 12. Theroof assembly 10 is adapted to be secured to aconvertible vehicle 20.Vehicle 20 includes adoor 22 that provides ingress and egress to the front seat (not shown) of thevehicle 20. It should be understood that the present invention may be used with either two-door or four-door vehicles. - The following description and the drawings illustrate the component parts for the left side but does not in every instance describe or illustrate the corresponding right side parts for clarity and brevity. It should be understood that the right side includes mirror image parts corresponding to the left side parts described. When reference is made to a side part it should be understood that both right and left sides are generally provided in the completed assembly.
- Referring to
FIG. 1 ,vehicle 20 including theroof assembly 10 is shown to illustrate the environment of the roof assembly of the present invention. Thedoor 22 of thevehicle 20 is connected by a hinge to theA pillar 24 of thevehicle 20 rearward of thewindshield 26. Thewindshield 26 includes aheader 28 to which theroof assembly 10 is joined as will be more particularly described below. The vehicle also includes aB pillar 30 that terminates at thebelt line 32 of the vehicle. -
FIG. 3 shows a stack formed during a first step of a method of making a reinforced composite inner roof panel of the cellular core sandwich-type of the present invention. In this example, the stack is made up successively of: abottom skin 40 made of a reinforced thermoplastic material; acellular core 42 made of thermoplastic material; and a load-bearingupper skin 44 made of a reinforced thermoplastic material. - In addition, the stack may include a
lower layer 46 made of a woven or non-woven material disposed on lowersurface bottom skin 40. Thelower covering layer 46 may be made of felt or of fabric such as polypropylene fabric. - The
skins cellular core 42 is an open-celled structure of the type made up of tubes or of a honeycomb, and it is made mainly of a polyolefin such as polypropylene. - In a first step of the method of making the
inner roof panel 14, the fiber mats, honeycomb and skins are cut to size. In a second step of the method of making theinner roof panel 14, the stack of layers is pre-assembled in a mold. Then, the pre-assembled stack is heated in an oven. - The pre-assembled stack is heated such that the
skins skins cellular core 42. Heating is controlled so that the mechanical characteristics of the resultinginner roof panel 14 are not degraded. - The temperature to which the pre-assembled stack is heated in the method of making the
inner roof panel 14 are at least above a temperature enabling theskins cellular core 42, in a time compatible with mass production constraints, without thecellular core 42 of the stack being weakened. Accordingly, the maximum temperature that the stack is heated to must avoid degrading the polypropylene. - In the method of making the
inner roof panel 14, it is possible to add the reinforcing slats to the stack that is to be thermoformed to make theinner roof panel 14. The method offers a heating capability that is sufficient to bond theskins - For a given pre-assembled stack temperature and a given pre-assembled stack-heating time, it is possible to bond a skin of given thickness. If the skin is too thin, it reaches a temperature such that it is degraded. If the skin is too thick, the heat does not arrive in sufficient quantity to enable the skin and the core to be bonded together.
- For example, in order to bond a skin made of a 4×1 woven fabric of weight per unit area of 915 g/m2 to a cellular core, provision is made for the heating time to lie in the range 55 seconds to 75 seconds. By using an identical skin of weight per unit area of 1,420 g/m2, a heating time lying in the range 70 seconds to 85 seconds is necessary to bond the skin to the cellular core without degrading it. Similarly, it has been determined that, for an identical skin having a weight per unit area of 710 g/m2, a heating time lying in the range 55 seconds to 65 seconds is necessary to bond it to the cellular core without degrading it.
- In the next step of the method of making the
inner roof panel 14, after the pre-assembled stack has been heated in an oven, theinner roof panel 14 is formed by subjecting the heated stack to cold-pressing in a mold under a pressure lying in the range 1×106 Pa to 3×106 Pa. - The method of making the
inner roof panel 14 comprises a small number of operations that are simple and quick to perform. It uses standard equipment (oven, press) for performing the above-mentioned operations which are well controlled, and therefore entirely suitable for being implemented in the field of manufacturing the inner roof panels, in which the parts are formed at high production throughputs, while also assuring consistent quality and price competitiveness. - The inner roof panels made by performing the method of the invention offer strength that is optimized locally, without suffering from any extra weight or from any extra manufacturing costs.
- Referring now to
FIG. 4 , there is illustrated a portion of ainner roof panel 14 which is formed in a pressing stage. Theinner roof panel 14 may be deep-drawn as is sometimes required as shown by the above-noted prior art. - One of the advantageous applications of the method is to make automotive inner roof panels. In particular, such inner roof panels may have attachment and
support structures 50 formed at theirouter periphery 52 on the edges of theinner roof panel 14. For example, as shown inFIGS. 4 and 5 , aninner roof panel 14 having anouter periphery 52 is formed by pressing to includesupport structures 50 where the inner roof panel is to be connected to the A, B and C pillars of a vehicle. - During the pressing step, a heating, ventilation or air conditioning (HVAC)
duct 54 may be formed that would allow air to pass between theouter roof panel 12 and the moldedinner roof panel 14. Theduct 54 could also function as a wiring conduit instead of an HVAC duct, if desired. A videodisplay mounting structure 56 could also be formed on the moldedinner roof panel 14. A side curtainair bag receptacle 58 could also be molded into theinner roof panel 14 between thesupport structures 50 of the A andB pillars vehicle 20. The structural component comprising the duct orconduit 54, videodisplay panel mount 56 and side curtainair bag receptacle 58 may be simply formed during the press forming process. The dies used to form theinner roof panel 14 include cavities for forming the structural component in the same step that theskins cellular core 42. - In addition, the molding process may include bonding a
headliner layer 46 to the lower surface of thebottom skin 40. Theheadliner layer 46 is a woven or non-woven fabric that bonds upon application of heat and pressure to the lower surface of the bottom skin. The different thicknesses of the inner roof panel may be formed by crushing or partially deforming thecellular core 42 to a desired depth. When theskins core 42 are heated, they may be subjected to pressure between upper and lower forming dies sufficient to cause the core 42 to be locally compressed to a reduced thickness. - It is possible to reduce the thickness of the core to about 20% of the original thickness of the layers in their uncompressed state. When the layers are compressed, the thickness of the inner roof panel may be reduced, thereby increasing head room while leaving certain areas uncompressed to provide head impact crush flexibility in the thicker areas. The uncompressed areas may also be used to form the structural components, such as the
duct 54, mountingsurface 56, orreceptacle 58. - Inner roof panels made in accordance with the present invention make it possible to reduce both the cost and weight of the inner roof panel made of steel or other plastic composites while obtaining equivalent mechanical characteristics.
- The inner roof panel of the invention may be used in any type of land vehicle, sea craft or aircraft.
- While the best mode for carrying out the invention has been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention as defined by the following claims.
Claims (7)
1-14. (canceled)
15. A method of making an inner roof panel for a vehicle roof assembly comprising:
cutting an upper skin of fiber reinforced thermoplastic material, a cellular core and a bottom skin of fiber reinforced thermoplastic material;
placing the upper skin, cellular core and bottom skin in a mold, having an upper die and a lower die that define a mold cavity having a varied thickness;
heating the upper skin, cellular core and bottom skin while in the mold;
applying pressure to the upper skin, cellular core and bottom skin while in the mold to form the inner roof panel that is thicker in local areas; and
removing the inner roof panel from the mold.
16. The method of claim 15 wherein the step of applying pressure further comprises forming head impact absorption areas by the thicker areas.
17. The method of claim 15 wherein the step of applying pressure further comprises forming a structural component by the thicker areas.
18. The method of claim 17 wherein the step of forming structural components further comprises forming a video display mount.
19. The method of claim 17 wherein the step of forming structural components further comprises forming a wiring conduit.
20. The method of claim 17 wherein the step of forming structural components further comprises forming a side curtain air bag pocket.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/099,131 US20050242626A1 (en) | 2002-04-19 | 2005-04-05 | Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/126,130 US6890023B2 (en) | 2002-04-19 | 2002-04-19 | Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same |
US11/099,131 US20050242626A1 (en) | 2002-04-19 | 2005-04-05 | Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same |
Related Parent Applications (1)
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US10/126,130 Division US6890023B2 (en) | 2001-07-24 | 2002-04-19 | Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same |
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US20050242626A1 true US20050242626A1 (en) | 2005-11-03 |
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US10/126,130 Expired - Lifetime US6890023B2 (en) | 2001-07-24 | 2002-04-19 | Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same |
US10/366,291 Abandoned US20030118202A1 (en) | 2001-07-24 | 2003-02-14 | Foldable speaker rack for use with spa |
US10/789,283 Expired - Fee Related US7073760B2 (en) | 2001-07-24 | 2004-06-09 | Support structure for spa speakers |
US11/099,131 Abandoned US20050242626A1 (en) | 2002-04-19 | 2005-04-05 | Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same |
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US10/126,130 Expired - Lifetime US6890023B2 (en) | 2001-07-24 | 2002-04-19 | Reinforced composite inner roof panel of the cellular core sandwich-type and method of making same |
US10/366,291 Abandoned US20030118202A1 (en) | 2001-07-24 | 2003-02-14 | Foldable speaker rack for use with spa |
US10/789,283 Expired - Fee Related US7073760B2 (en) | 2001-07-24 | 2004-06-09 | Support structure for spa speakers |
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US7677009B2 (en) | 2007-02-02 | 2010-03-16 | Nova Chemicals Inc. | Roof truss system |
US20170297510A1 (en) * | 2016-04-18 | 2017-10-19 | Hyundai Motor Company | Roof for vehicle |
Also Published As
Publication number | Publication date |
---|---|
US6890023B2 (en) | 2005-05-10 |
US20030118202A1 (en) | 2003-06-26 |
US7073760B2 (en) | 2006-07-11 |
US20030197400A1 (en) | 2003-10-23 |
US20040222342A1 (en) | 2004-11-11 |
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|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |